we share president obama's preference to see iran's nuclear weapons program and through diplomacy. but for diplomacy to succeed, it must be coupled with powerful sanctions and a credible military threat. >> now, president obama defended the international deal which many allies in the middle east area really are very nervous about, insisting his bottom line is to prevent iran from collecting a nuclear weapon and the sanctions relief will depend on iran's actions going forward and that is what has so many in this region worried, greg. they don't really trust iran and they are afraid that the united states will be tricked by iran's sweet talking going forward. >>> secretary of state john kerry insists that israel and the united states are in snync. from where you are in jerusalem, does it seem that way? >> reporter: there's a lot of tension. they are simply not on the same side although they are trying to sort of publicly get their act together. netanyahu and perez had very kind words to say this weekend and perez even saying that he's willing to speak with the new iranian president.